It happened to me too, when got hundreds of events message incomming some message lost, some come late 10 to 20 minutes.
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Post : 21/05/2020
I used to read document Line Bot not allow send to group chat. You can send message reply with only after recieve event from WebHook.
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Post : 16/10/2019
I have the same question but I am from Cambodia
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Post : 18/06/2019
I have the same problem in Cambodia
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Post : 18/06/2019